What do Orsini et al.’s work add to the earlier works on international regimes.

The world during the Cold War was bi-polar meaning that two superpowers divided the world system. After the fall of the USSR, the US emerged as the unipolar power and hegemon.
Drawing on the Cold War and US invasions of Afghanistan and Iraq, explain the significance of polarity on the world system. 
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Instructions: Your initial post should be at least 350 words. Include In-text citations and a reference page.
What do Orsini et al.’s work add to the earlier works on international regimes. How have understandings changed or evolved, if at all?
Instructions: Your initial post should be at least 350 words. Include In-text citations and a reference page.